SUB_DT_DT

Subtract DATE_AND_TIME from DATE_AND_TIME

SUB_DT_DT subtracts a value of the data type DATE_AND_TIME from another DATE_AND_TIME value. The result is stored in the output variable of the data type TIME.

Parameters

Input

Unnamed input (DATE_AND_TIME): 1st input: minuend
Unnamed input (DATE_AND_TIME): 2nd input: subtrahend

Output

Unnamed output (TIME): Result

Remarks

The TIME result is only valid if the difference between the minuend and subtrahend is smaller than or equal to the maximum TIME duration allowed. Otherwise an overflow of the TIME result variable occurs and the CARRY flag is set.

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		DT_value1: DATE_AND_TIME:=DT#2011-12-24-18:29:59;
		DT_value2: DATE_AND_TIME:=DT#2011-12-06-05:21:28;
		TIME_result: TIME:=T#0s;
	END_VAR

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 5 ;
        NETWORK_BODY
B(B_VARIN,,DT_value1,16,1,18,3,);
B(B_VARIN,,DT_value2,16,2,18,4,);
B(B_VAROUT,,TIME_result,26,1,28,3,);
B(B_F,SUB_DT_DT!,Instance,18,1,25,4,,?D?D?C);
L(1,0,1,5);
L(25,2,26,2);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

TIME_result := SUB_DT_DT(DT_value1, DT_value2);